Number of degree-n permutations such that number of cycles of size 2k is even (or zero) and number of cycles of size 2k-1 is odd (or zero), for every k.

A131526

Number of degree-n permutations such that number of cycles of size 2k is even (or zero) and number of cycles of size 2k-1 is odd (or zero), for every k.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =3a(4) =11a(5) =40a(6) =184a(7) =1036a(8) =12949a(9) =88488a(10) =807008a(11) =7362586a(12) =113572183a(13) =1238477032a(14) =15630890560a(15) =228998728050

External references